Here are a couple of tricks that worked in the past. I don’t think they work now, so this is just a placeholder to remind me to follow up at a later time.
# Disable screensaver
vim /etc/X11/xorg.conf
### add these lines ###
Section "ServerFlags"
Option "blank time" "0"
Option "standby time" "0"
Option "suspend time" "0"
Option "off time" "0"
EndSection
OR
vim /etc/X11/xorg.conf.d/screensaver
### add this line ###
Option "DPMS" off
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